Champion Iridium Plug Number RC9WMPB4 Spark Plug - 9806 Part #: 9806 Line: CHP Champion Iridium Plug Number RC9WMPB4 Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14 Heat Range: 8 Hex Size (in): 5/8 Inch Preset Gap (in): 0.041 Inch Preset Gap (mm): 1.05mm Center Electrode Tip Material: Iridium Ground Electrode Tip Material: Platinum Service Number: RC9WMPB4 Metallurgy: Iridium/Platinum Show More Show Less